Comprehensive batch studies on removal of fluoride from aqueous solution by acid and alkali-activated adsorbents prepared from Dal lake weeds: Mechanism, Kinetics and Thermodynamics.

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  • Author(s): Dar FA;Dar FA; Kurella S; Kurella S
  • Source:
    Environmental research [Environ Res] 2024 Oct 15; Vol. 259, pp. 119493. Date of Electronic Publication: 2024 Jun 27.
  • Publication Type:
    Journal Article
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0147621 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1096-0953 (Electronic) Linking ISSN: 00139351 NLM ISO Abbreviation: Environ Res Subsets: MEDLINE
    • Publication Information:
      Publication: <2000- > : Amsterdam : Elsevier
      Original Publication: New York, Academic Press.
    • Subject Terms:
      Fluorides*/chemistry ; Fluorides*/isolation & purification ; Water Pollutants, Chemical*/chemistry ; Thermodynamics* ; Water Purification*/methods; Adsorption ; Kinetics ; Hydrogen-Ion Concentration ; Plant Weeds/chemistry ; Lakes/chemistry ; Sulfuric Acids/chemistry
    • Abstract:
      An efficient and economical way of eliminating fluoride from water is being investigated by employing the buoyant aquatic plant (Dal weed). Two post-pyrolysis chemical activation alteration techniques were implemented: acidic activation by employing sulfuric acid (H-activation) and alkaline activation using sodium hydroxide (OH-activation). The batch kinetic studies have been carried out considering varying starting fluoride levels such as 2-10 mg/L. The impact of diverse procedural factors, including dosage of Dal weed, starting fluoride level, pH and contact duration was observed to determine their influence on fluoride adsorption kinetics. Based on analyzed exploratory results, removal efficacy of 63% for the OH-activated carbon and 83% for H-activated carbon was achieved at commencing fluoride level of 10 mg/L, adsorbent dosage of 0.8 g, at 25 °C after 120 min. The maximal fluoride uptake capacity for H-activated carbon was observed to be 78.158 mg/g. Kinetic investigations showed that the Freundlich isotherm model provided a satisfactory match with an R 2 value of 0.99. The reaction order nature adhered to kinetics resembling pseudo second order. Thermodynamic investigation revealed endothermic sorption, with negative ΔG indicating spontaneous fluoride uptake. In comparison, the positive number for ΔS suggested random behavior at the contact involving the adsorbent and adsorbate. The investigations into the regeneration capabilities of the adsorbent material revealed that even after undergoing for five consecutive cycles of adsorption and regeneration, the adsorbent exhibited an uptake potential of 45%. The presence of competing ions in the solution negatively impacted defluoridation efficacy, with the influence following the order of HCO 3 - < NO 3 - < Cl - < SO 4 2- < PO 4 3- .
      Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024 Elsevier Inc. All rights reserved.)
    • Contributed Indexing:
      Keywords: Activated carbon; Adsorption; Defluoridation; Fluoride; Kinetics; Thermodynamics
    • Accession Number:
      Q80VPU408O (Fluorides)
      0 (Water Pollutants, Chemical)
      0 (Sulfuric Acids)
    • Publication Date:
      Date Created: 20240629 Date Completed: 20240828 Latest Revision: 20240828
    • Publication Date:
      20240830
    • Accession Number:
      10.1016/j.envres.2024.119493
    • Accession Number:
      38944101